The past week has been one of milestones: the IBM PC turned 30, just days before the Web itself turned 20. Of course, both are still whippersnappers compared to the Apple II, but it's timely to consider the birthplace of that and other innovations.

These inventions culminated in 1973 with the Xerox Alto, the first GUI-driven personal computer (check out the three-button mouse!) Sadly the Alto was never sold commercially, and only 2,000 units were built — but don’t worry, its legacy lived on with the 1977 Apple II, the first mouse-and-GUI-driven home computer, and the 1984 Macintosh.

Xerox’s Palo Alto Research Center (PARC) develops the “Alto”, a breakthrough computer which used a pointing device called a “mouse”, a bit-mapped graphic screen, and icons to represent documents. Also, it had a 2.5 megabyte removable disk cartridge and the first implementation of Ethernet. It cost $15,000 just to build it, and only 1,200 were ever produced. This computer and the Xerox Star were the inspirations within a decade for the Lisa and the Macintosh.

Readers also take exception to a statement on the preceding page that "in 1981, IBM released the Personal Computer, the first home computer made from off-the-shelf parts". Was not the Apple II that machine? At least one reader says yes:

The Apple II was all off the shelf parts 6502 processor, 4K memory (8102 DRAM?), etc. There were no custom IC's. The only "non off the shelf" were things like the power supply, keyboard, paddles, etc. The same was true for other microcomputers sold before IBM played catch up with the 5150 (including the Altair 8800). On all of the microcomputers, (including the IBM 5150) the design, circuit board, case, keyboard, expansion slots, power supply, were custom as well as the BIOS. The IBM 5150 helped to mainstream microcomputers (outside the classroom) because "No one ever got fired for recommending IBM" — a common quote from that era.

What say you, dedicated retrocomputing enthusiasts? Did the author of this gallery do his homework, or are a few of his facts a wee bit off?